[Bug runtime/21020] reorganize argument passing from java probes

["fche at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21020

--- Comment #3 from Frank Ch. Eigler <fche at redhat dot com> ---
> If I built correctly from git source, as of commit f8bc2a5eb3e91ce7
> "PR21020: reorganize data passing abi for java method parameters",
> it is no longer possible to access java.lang.String argument using
> --compatible=3.0 option because $arg1 in method2 points to NULL.
> Is this what you meant?

Yeah, this was a side-effect of code cleanup.  Passing strings under
the previous abi implied a memory leak (a strdup for every call that
was not freed, because every type was cast to an int64_t).  That leak
is fixed under --compatible=3.0 but at the cost of not having strings
be copied at all.  That is a regression, but it didn't seem like a
big one.  Do you think it is important to have it work under
--compatible=3.0?

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